SQL Server: Examples of PIVOTing String data

Tim_Cochran_2626 0
Viewed 194843

Trying to find some simple SQL Server PIVOT examples. Most of the examples that I have found involve counting or summing up numbers. I just want to pivot some string data. For example, I have a query returning the following.

Action1 VIEW  
Action1 EDIT  
Action2 VIEW  
Action3 VIEW  
Action3 EDIT

I would like to use PIVOT (if even possible) to make the results like so:

Action1 VIEW EDIT  
Action2 VIEW NULL  
Action3 VIEW EDIT

Is this even possible with the PIVOT functionality?

pivot tsql sql-server
7 Answers

Remember that the MAX aggregate function will work on text as well as numbers. This query will only require the table to be scanned once.

SELECT Action,
       MAX( CASE data WHEN 'View' THEN data ELSE '' END ) ViewCol, 
       MAX( CASE data WHEN 'Edit' THEN data ELSE '' END ) EditCol
 FROM t
 GROUP BY Action
John_42860

If you specifically want to use the SQL Server PIVOT function, then this should work, assuming your two original columns are called act and cmd. (Not that pretty to look at though.)

SELECT act AS 'Action', [View] as 'View', [Edit] as 'Edit'
FROM (
    SELECT act, cmd FROM data
) AS src
PIVOT (
    MAX(cmd) FOR cmd IN ([View], [Edit])
) AS pvt
miles_38980

Well, for your sample and any with a limited number of unique columns, this should do it.

select 
    distinct a,
    (select distinct t2.b  from t t2  where t1.a=t2.a and t2.b='VIEW'),
    (select distinct t2.b from t t2  where t1.a=t2.a and t2.b='EDIT')
from t t1
vzczc_2240

I had a situation where I was parsing strings and the first two positions of the string in question would be the field names of a healthcare claims coding standard. So I would strip out the strings and get values for F4, UR and UQ or whatnot. This was great on one record or a few records for one user. But when I wanted to see hundreds of records and the values for all usersz it needed to be a PIVOT. This was wonderful especially for exporting lots of records to excel. The specific reporting request I had received was "every time someone submitted a claim for Benadryl, what value did they submit in fields F4, UR, and UQ. I had an OUTER APPLY that created the ColTitle and the value fields below

PIVOT(
  min(value)
  FOR ColTitle in([F4], [UR], [UQ])
 )
user_110813480
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